My finder icon in the dock now has a green hat

Move to the Desktop temporarily

com.apple.dock.plist

com.apple.dock.extra.plist

com.apple.dock.db.plist

Found in your Finder>Go>Go to Folder copy and paste:

~/Library/Preferences/com.apple.dock.plist

and then again

~/Library/Preferences/com.apple.dock.extra.plist

and then again

~/Library/Preferences/com.apple.dock.db.plist

(or once you are there in Preferences select those 3 to move)

Relaunch the Finder as before, Relaunch the Dock as before. (or log out and back in again.)

If it is resolved you can delete the plist on the Desktop

From the terminal

~/Applications/Utilities/Terminal.app

copy and paste :

killall Dock

(and then hit the enter key to execute the command)

Just to alleviate any concern, there are no OSX viruses and if it was caused by malware or adware it would have to be the most ineffective example in the history of computing. You could try creating a new user and see if it occurs there. Most likely it is caused by a corrupt plist file or icon. Post back.

You can try relaunching your Finder

>Force Quit>Finder>Relaunch

You're welcome.

MorganFromSeattle wrote:

Thanks leroydouglas, that did the trick.

Good computing MorganFromSeattle !